Source : Webster's Revised Unabridged Dictionary (1913)

Laughable \Laugh"a*ble\, a.
   Fitted to excite laughter; as, a laughable story; a laughable
   scene.

   Syn: Droll; ludicrous; mirthful; comical. See {Droll}, and
        {Ludicrous}. -- {Laugh"a*ble*ness}, n. -- {Laugh"a*bly},
        adv.

Source : WordNet®

laughable
     adj 1: completely devoid of wisdom or good sense; "the absurd
            excuse that the dog ate his homework"; "that's a
            cockeyed idea"; "ask a nonsensical question and get a
            nonsensical answer"; "a contribution so small as to be
            laughable"; "it is ludicrous to call a cottage a
            mansion"; "a preposterous attempt to turn back the
            pages of history"; "her conceited assumption of
            universal interest in her rather dull children was
            ridiculous" [syn: {absurd}, {cockeyed}, {derisory}, {idiotic},
             {ludicrous}, {nonsensical}, {preposterous}, {ridiculous}]
     2: arousing or provoking laughter; "an amusing film with a
        steady stream of pranks and pratfalls"; "an amusing
        fellow"; "a comic hat"; "a comical look of surprise";
        "funny stories that made everybody laugh"; "a very funny
        writer"; "it would have been laughable if it hadn't hurt
        so much"; "a mirthful experience"; "risible courtroom
        antics" [syn: {amusing}, {comic}, {comical}, {funny}, {mirthful},
         {risible}]